EA023363B1 - GAS ENGINE SYSTEM WITH THE FUNCTION OF DETECTION OF THE OCCURRENCE OF THE FAULT OF THE MECHANISM OF GAS PRESSURE DETERMINATION - Google Patents

Abstract

In the gas engine system, the control unit (6) contains a section (102) of the first determination (102) to determine, as a first measurement, whether the gas pressure is a low pressure less than a predetermined pressure, while the control device recognizes that the gas valve (4) is closed; a second measurement section (105) for determining as a second measurement whether the gas pressure is high pressure, higher or equal to a predetermined pressure, based on the pressure information, while the control device recognizes that the gas valve is open if during the first measurement it is decided that the gas pressure is low pressure; a start section (101) for performing the first measurement and the second measurement before starting the gas engine when the start command is received; and the operation start section (110) for opening the gas valve (4) and starting the gas engine operation, if it is determined at the first measurement that the gas pressure is low pressure, and if at the second measurement it is determined that the gas pressure is high pressure.

Description

The invention relates to a gas engine system having a gas engine, a gas channel for supplying a fuel gas to a gas engine, a gas valve for opening and closing a gas channel, a control device for controlling a gas valve, a pressure sensor for outputting pressure information corresponding to a gas pressure in a gas the channel after the gas valve, and the transmission mechanism for transmitting pressure information from the pressure sensor to the control device.

Traditionally, a pressure sensor is installed to detect the pressure in a gas pipe supplying gas to a gas engine on a gas pipe. An example of a gas pressure detection device is shown in FIG. 2 of the patent document 1. On the gas pipe the pressure sensor, gas valves for opening and closing the gas pipe and the gas engine are arranged in the specified order. Gas valves consist of two solenoid valves and a pressure control valve. When the gas valve opens the gas pipe, the pressure in the gas pipe changes. The change in pressure in the gas pipe is detected by a pressure sensor.

The detection device corresponding to patent document 1 always monitors the output signal of the pressure switch, and when the gas pressure in the gas pipe decreases, the detection device turns off the gas engine. The reasons for this are: if the gas engine continues to operate in a state in which the gas pressure is lowered, the pressure in the gas pipe becomes negative, so that there is a risk of a malfunction, in which air from the orifice formed in the gas pipe, for example, port supply to other gas equipment. In the detection device corresponding to patent document 1, a decrease in gas pressure is detected, whereby the occurrence of such a malfunction can be prevented.

In this connection, to save energy, a pressure switch with a b-contact (break contact) is widely used as a pressure sensor in Japan. When the gas pressure is above the set pressure, the b contact opens and is set to a non-conducting state. On the other hand, when the gas pressure is below the set pressure, the b-contact closes and is set to a conducting state. That is, when the gas pressure is below the set pressure, a detection signal is output from the output of the pressure switch, and when the gas pressure is above the set pressure, the signal from the pressure switch output is not output. Namely, since the pressure switch goes into a conducting state only when a malfunction occurs, at which the gas pressure in the gas pipe drops below the set pressure, the energy consumption of the pressure switch is kept low. In particular, if a battery is used as the power source of the pressure switch instead of the power source of the system, the battery life can be extended.

Patent document 1: Japanese publication of utility model number H07-30931.

As described above, in a pressure switch having a b-contact, the detection signal is output if the gas pressure is low pressure, and the signal is not output if the gas pressure is high pressure. However, when the pressure switch fails, and also when the signal line going from the pressure switch to the control device breaks, the control device cannot detect the signal from the pressure switch, regardless of the magnitude of the gas pressure.

Accordingly, an object of the present invention is to create a gas engine system that determines whether a malfunction has occurred, such as a failure of a pressure switch and an open signal line, etc., and can accurately control the gas pressure.

The gas engine system of the present invention includes: a gas engine, a gas channel for supplying fuel gas to a gas engine, a gas valve for opening and closing a gas channel; a control device for detecting the opening and closing of the gas valve and controlling the gas valve; a pressure sensor for outputting pressure information corresponding to the gas pressure in the gas channel after the gas valve; and a transmission mechanism for transmitting pressure information from the pressure sensor to the control device in which the device comprises: a first determination section for determining as a first measurement whether the gas pressure is a low pressure less than a predetermined pressure, based on the info A pressure is set at a time when the control device recognizes that the gas valve is closed; the opening section for opening the gas valve, if during the first measurement it is determined that the gas pressure is low pressure; a second determination section for determining as a second measurement whether the gas pressure is a high pressure equal to or greater than the predetermined pressure, based on the sensor information, while the control device recognizes that the gas valve is open if the first measurement indicates that the gas pressure is low pressure; a closing section for closing the gas valve after the second measurement; and a malfunction determination section to establish that a malfunction has occurred, if during the first measurement it is determined that the gas pressure is high, or if during the second measurement it is established that the gas pressure is low.

In accordance with the gas engine system of the present invention, the control device can determine whether the pressure information actually transmitted corresponds to

- 1 023363 to the control device from the pressure sensor, the gas pressure determined during the opening and closing of the gas valve, and can determine on the basis of the result of the determination whether a malfunction has occurred.

Preferably, the control device controls the gas engine and further comprises: a start section for performing the first measurement and the second measurement before starting the gas engine when the start command is received; and a start-up section for opening the gas lamp and starting up the gas engine, if it is determined in the first measurement that the gas pressure is low, and if in the second measurement it is determined that the gas pressure is high.

In the gas engine system of the present invention, a control device prevents the gas engine from starting when there is a malfunction in the gas pressure detection mechanism, such as a pressure transmission mechanism or a pressure switch.

Preferably, the pressure sensor is a pressure switch having a b-contact that goes into a conducting state when the gas pressure is low pressure and that goes into a non-conducting state when the gas pressure is high pressure.

If it is determined before opening the gas valve that the pressure switch is in a non-conducting state, in the gas engine system of the present embodiment, the control device can detect the failure of the pressure switch or the break of the output line of the pressure switch and so on. If it is determined that the pressure switch does not switch to a non-conducting state, even when the gas valve opens, the control device can detect a failure of the pressure switch or a short circuit between the output line of the pressure switch and the power supply, and so on.

Preferably, the pressure sensor is a pressure switch having an a-contact, which is in a conducting state when the gas pressure is high pressure, and which becomes non-conducting when the gas pressure is low pressure.

In the gas engine system of the present embodiment, if it is determined that the pressure switch before opening the gas valve is in a conducting state, the control device can detect a failure of the pressure switch or a short circuit between the output line of the pressure switch and the power supply and so on. If it is determined that the pressure switch does not switch to a conductive state, even when the gas valve is open, the control device can determine the failure of the pressure switch or the interruption of the output line of the pressure switch, and so on.

Preferably, the pressure information transmission mechanism further comprises a logic circuit for generating a signal combining a direct signal, reflecting the conductive or non-conductive state of the pressure relay, and a reverse signal inverted to the conductive or non-conductive state of the pressure relay.

According to the gas engine system of the present invention, the control device can generate an output signal even if the pressure relay having a contact is in a non-conducting state.

The invention is illustrated by drawings, which show the following: FIG. 1 is a generalized block diagram of a gas engine system;

FIG. 2 illustrates the execution structure of the launch control and the fault detection control; FIG. 3 is a flowchart of a method for starting a gas engine system;

FIG. 4 is a timing diagram of the launch control during normal operation;

FIG. 5 is an example of a timing diagram of a launch control when a first fault occurs;

FIG. 6 is an example of a timing diagram of a launch control when a second fault occurs;

FIG. 7 is an example of a timing diagram of a launch control in the event of a gas pressure malfunction.

FIG. 1 is a generalized block diagram of a gas engine system 1. System 1 contains a gas engine 2, a gas pipe (gas channel) 3, a gas valve 4, a gas pressure switch 5 (pressure sensor), a control unit 6 (control device), a transmission mechanism 7, a generator 8, a fan 9, an operational device 10 ( input device), the display device 11 (alarms) and the engine 15 starter.

Gas pipe 3 is connected to gas pipe 20 from the outside of gas engine system 1 and provides gas engine 2 with fuel gas supply. Along the gas pipe 3 in the following order are located: the connecting port 3a, which forms the beginning of the gas pipe 3, the gas valve 4, the gas pressure switch 5 and the gas engine 2. The gas valve 4 is an electromagnetic control valve and opens and closes the gas pipe 3. Gas switch 5 pressure displays information about the pressure corresponding to the gas pressure in the gas pipe 3 on the output side of the gas valve 4. The control unit 6 controls the gas engine 2, the gas valve 4, the generator 8, the fan 9,

- 2 023363 indicator device 11 and starter engine 15. The transmission network 7 transmits pressure information from the output of the gas pressure relay 5 to the control unit 6. Generator 8 generates electricity due to the rotational energy transmitted to the output shaft 21 of the gas engine 2. The fan 9 vents the interior of the system 1. The gas engine system 1 is enclosed, for example, in a casing. Operational device 10 inputs various commands to control unit 6 based on the operation entered by the operator. The display device 11 displays image information output from the control unit 6. The engine 15 starter starts the gas engine 2.

The gas pressure switch 5 has an L-contact. If the gas pressure is below the set pressure of the pressure switch, the b-contact is closed and is in a conducting state, so that current flows through the interface panel 13 connected to the b-contact. On the other hand, when the gas pressure is above the set pressure, the b contact opens and goes into a non-conducting state. The set pressure, which serves as a threshold value, can be set to a predetermined selected pressure.

That is, if the gas pressure is below the set pressure, a detection signal is output to the transmission mechanism 7 from the gas pressure switch 5, and when the gas pressure is higher than the setting pressure, the signal from the gas pressure switch 5 is not output. Information about the pressure from the output of the gas pressure switch 5 consists of a detection signal generated by conduction and a non-detection signal, which means no conductivity. Any of the detection or non-detection signals is output as pressure information at the appropriate points in time.

The transmission mechanism 7 comprises output lines 12a and 12b δν, an interface panel (logic circuit) 13 and a forward signal line 14a and a reverse signal line 14b.

Each of the output lines 12a and 12b δν connects the gas pressure switch 5 and the interface panel 13. A circuit is formed between the gas pressure switch 5 and the interface panel 13 by means of the output lines 12a, 12b δν. Information about the pressure is transmitted from the gas pressure switch 5 to the interface panel 13 via the output lines 12a, 12b δν.

The interface panel 13 generates a signal combining the direct signal and the return signal based on the pressure information obtained from the output of the gas pressure switch 5, and inputs the combined signal to the control unit 6 as pressure information. The direct signal is a detection signal or a non-detection signal, reflecting the output signal of the gas pressure switch 5. On the other hand, the return signal is a detection signal or a non-detection signal, obtained by inverting the output signal of the gas pressure switch 5. That is, if the gas pressure switch 5 is in the conducting state, the combined signal is set as follows: the forward signal serves as the signal corresponding to the state ΟΝ, and the return signal serves as the signal corresponding to the state ΟΡΡ. If it is in a non-conducting state, the combined signal is set as follows: the forward signal serves as the signal corresponding to the state ΟΡΡ, and the reverse signal serves as the signal corresponding to the state ΟΝ. Forming a reverse signal in this way allows the signal передавать to be transmitted even in a non-conducting state.

Each of the lines 14a of the direct signal and 14b of the return signal is connected to the interface panel 13 and the control unit 6. The direct signal is transmitted to the control unit 6 via the forward signal line 14a and the reverse signal is transmitted to the control unit 6 via the reverse signal line 14b. In the present embodiment, although the interface panel 13 is structurally separate from the control unit 6, the function of the interface panel 13 may be introduced into the control unit 6.

The following will describe the system startup management 1. The launch management is the system startup management 1. The launch management includes fault detection management. The fault detection control is a check control, whether the pressure information actually transmitted to the control unit 6 corresponds to the gas pressure determined when opening and closing the gas valve 4. Hereafter, a fault indicates that the pressure information actually transmitted to the control unit 6, does not correspond to the gas pressure determined when opening and closing the gas valve 4. Therefore, the cause of the malfunction includes not only the failure of the pressure sensor 5 and the transmission mechanism 7, but also with erzhit failure of the gas valve 4 and reduced gas pressure when the gas is supplied from the outside.

FIG. 2 shows a configuration for performing startup control and fault detection management. The configuration is formed by the hardware and software, which form the control unit 6. The control unit 6 comprises: a start section 101, a first determination section 102, a first processing section 103, an opening section 104, a second determination section 105, a second processing section 106, a closing section 107, a fault definition section 108, a pre-cleaning section 109 and a start section 110 work.

FIG. 3 is a flowchart of the startup control operations of the system 1. The launch control comprises the steps δ1-δ12. Startup management includes fault detection management consisting of the δ1-δ9 stages.

Before the system is started, system 1 is turned off and gas valve 4 is closed. Therefore,

- 3 023363 a low pressure is maintained in the gas pipe 3. To start the system 1, the operator enters a start command to the control unit 6, controlling the operational device 10. At step 81, based on the entered start command, the start section 101 starts the start control.

Step 82 is performed following step 81. At step 82, as confirmation of the initial state of the system (first definition), the first determination section 102 determines whether the gas pressure is low pressure based on the pressure information when the gas valve 4 is closed. Specifically, the first determination section 102 determines whether a signal is received which combines the direct signal ΟΝ and the return signal ΟΡΡ. Here, the direct signal ΟΝ means the state in which the signal is inputted to the control unit 6 from the direct signal line 14a, and the return signal ΟΡΡ means the state in which the signal is not inputted to the control unit 6 from the return signal line 14b.

If no malfunction has occurred and the gas pressure is below the set pressure, then since the gas pressure switch 5 is in the conducting state, a signal is received that combines the direct signal ΟΝ and the return signal.

On the other hand, if the signal combining the direct signal ΟΝ and the return signal is not received, it is considered that there is a malfunction. The fault identified in step 82 (first definition) is referred to as the first fault. At least one of the causes (1a), (2a), (3), (4) and (5) is considered as the cause of the first malfunction.

(la) Failure of the gas pressure switch 5 pressure: a condition in which the b-contact is always open and the b-contact cannot be closed (no contact, etc.).

(2a) Break of output line 12a, 12b 8 \ 7.

(3) Interface panel failure 13.

(4) An open signal line 14a, 14b or a short circuit between the signal line 14a, 14b and a power source.

(5) Failure to close the gas valve 4.

If the signal combining the direct signal ΟΝ and the return signal ΟΡΡ is not received, the fault determination section 108 determines that a malfunction has occurred. If it is determined that the malfunction has occurred, steps 83, 84 are performed. At step 84, the launch control is interrupted.

At step 83, the first processing section 103 controls the display (alarm) 11 to inform the operator of the occurrence of the first malfunction. Specifically, for example, section 103 of the first processing allows displaying text information on the display of the display device 11 ana b a la bécénénénénénénénénés 1 ps ίηίΐίαΐ k1a1s o £ 1 ps 5Ucht (upon confirmation of the initial state of the system, a malfunction was detected).

Step 84 is performed after step 83. In step 84, the first processing section 103 interrupts the launch control and terminates the operation of system 1.

If, at step 82, a signal combining the direct signal ΟΝ and the return signal ΟΡΡ is received, step 85 is performed. At step 85, the opening section 104 opens the gas valve 4. If no malfunction has occurred, the pressure in the gas pipe 3 increases when the gas valve 4 is opened.

Step 86 is performed after step 85. At step 86, as confirmation of the gas pressure before starting (second definition), section 105 of the second definition determines that the gas pressure is equal to or higher than the set pressure, based on the pressure information when gas valve 4 is open . Specifically, section 105 of the second determination determines whether a signal is received, combining the direct signal ΟΡΡ and the return signal.

If no fault has occurred and the gas pressure is equal to or higher than the set pressure, since the gas pressure switch 5 is in a non-conducting state, a signal is received that combines the direct signal ΟΡΡ and the return signal.

On the other hand, if the signal combining the direct signal ΟΡΡ and the return signal is not received, it is considered that a fault has occurred. The fault defined in step 86 (second definition) is referred to as the second fault. At least one of the causes (1b), (2b), (3), (4), (5) and (6) is considered as the cause of the second failure.

(lb) Failure to open the gas pressure switch 5: a condition in which the b contact is always closed and the b contact cannot open (welding of contacts, etc.).

(2b) Short circuit between the output line 12a, 12b 8 \ 7 and the power supply.

(3) Interface panel failure 13.

(4) An open signal line 14a, 14b or a short circuit between the signal line 14a, 14b and a power source.

(5) Failure to open the gas valve 4.

(6) Reducing the pressure at the gas source.

If the signal combining the direct signal ΟΡΡ and the return signal ΟΝ is not received, the fault determination section 108 determines that a malfunction has occurred. If it is determined that the malfunction has occurred, steps 87-89 are performed. At step 89, start control is interrupted.

At step 87, the closing section 107 closes the gas valve 4.

At step 88, the second processing section 106 controls the display (alarm) 11 to

- 4 023363 Inform the operator of the occurrence of a second fault. Specifically, for example, section 106 of the second processing allows display on the display device 11 of the display text information ana abagnatia la8 hoe goipb ίη paigtype 1y with yes8 rhegkighegoguepar-ip (upon confirmation of gas pressure before launching, a malfunction was detected).

After step 88 is performed by step §9. In step 89, the second processing section 106 interrupts the launch control and terminates the operation of the system 1.

If, at step 86, a signal is received, combining the direct signal ΟΡΡ and the return signal, step 810 is performed. At step 810, the closing section 107 closes the gas valve 4.

After step 810, step 811 is performed. At step 811, pre-cleaning section 109, before starting operation of the gas engine 2, actuates fan 9 to ventilate the interior of system 1.

After step 811, step 812 is performed. Step 812 is performed if, at step 82, a signal combining the direct signal сигнал and the return signal ΟΡΡ is received, and in step 86 a signal is received, combining the direct signal and the reverse signal. That is, if it is considered that the malfunction has not occurred, step 812 is performed. At step 812, the start section 110 starts the gas engine 2 by opening the gas valve 4 immediately after starting the engine 15 of the starter.

The operation of system 1 in launch control will be shown with reference to FIG. 4-7.

In all of FIG. 4-7 shows timing charts of the launch control.

FIG. 4-9, the horizontal axis is the time axis. Along the horizontal axis, the names of the corresponding procedures contained in the launch control are listed. FIG. Group 4 of procedure names contains νΑΡΠΝΟ (wait), ΙΝΙΤΙΑΡ 8TATE (checking the initial state), ΟΗΕΟΚΙΝΟ ΟΑ8 KREE88IKE ΒΕΡΟΚΕ 8TACT-IL (checking gas pressure before starting), ΡΚΕΡΑΚΙΝΟ ΡΟΚ 8TACT-IR (preparing for starting, \\ 'A1T1 \ C . ΡΟΚ ΕΝΟΙΝΕ 8TAKT-IR (wait for the engine start), ΕΝΟΙΝΕ 8TAKT-IL (engine start), νΑΡΠΝΟ ΡΟΚ \ ΑΚΜ IR ΑΝΌ ΡΟVΕΚ ^ Α ^ Μ ^ δΙΟΝ (wait for the warm-up and start of energy transfer), ΈΟνΕΚ ΤΚΑN8ΜI88IΟN (energy transfer), ΈΟνΕΚ ΤΚΑN8ΜI88IΟN 8TOR (cessation of energy transfer), ΕΝΟΙΝΕ ΡΟΟί- ΌΟ \ Ν (engine cooling) and ΕΝΟΙΝΕ 8ΗυΤ ^ ΟVN ЛΡΤΕΚС ΟΟ ^ INΟ (engine cooling and subsequent cooling) .In Fig. 5, the group of procedure names additionally contains δΗΠΊΌΟνΝ ΌυΕ THAT ΡIΚ8Τ ΑΒNΟΚΜЛ ^ IΤΥ (disconnection due to the first fault). In Fig. 6, the group of procedure names further contains δΗυΊΌΟνΝ ΌυΌ TO 8ΕΡΟΝΌ nΟΚΜ ^ ^ IΤΥ (shutdown due to a second fault) .In Fig. 7, the group of procedure names additionally contains ^ ΕΤΕCΕΤΕINΟ ΑΒΝΟΚΜΑΡ ΟΑ8 ΡΚΕ88υΚΕ (detection of a malfunction related to gas pressure) and 8HPT1X) \\ '\ ΌυΕ TO ΑΒΝΟΚΜΑΡ ΟΑ8 ΡΚΕ88υΚΕ (shutdown associated with abnormal gas pressure).

The names of the procedures shown in FIG. 4-7 comprise the steps shown in FIG. 3. ΙΝ ΙΝ TOL 8 ΤΑΤΕ (checking the initial state) contains step 82. ΟΑ 8 ΡΚΕ 88 ΚΕ 8ΤΑΚΤ-υΡ (checking gas pressure before starting) contains steps 85, 86. INΟ ΡΟΚ 8 Τ L-υΡ (preparing for launch) contains step 810. νΑΠΊΝΟ ΡΟΚ ΕΝΟΙΝΕ 8ΤΑΚΤ-υΡ (wait for the engine to start) contains step 811. ΕΝΟΙΝΕ 8ΤЛΚΤ-υΡ (start the engine) contains step 812. 8НРТ1Х) \\ '\ ΌυΕ THAT GSHTT ЛΒNΟΚΜЛ ^ IΤΥ (shutdown due to the first fault) contains steps 83, 84. The δΗυΊΌΟνΝ ΌυΕ THAT 8ΕΡΟΝΌ ΑΒNΟΚΜL ^ IΤΥ (shutdown due to the second fault) involves steps 87-89.

FIG. 4-7, along the vertical axis, the operating states of the corresponding elements contained in the system are listed. The group of elements contains 8ΤΤΚΤ-υΡ ΡΟΜΜΑΝΌ (start command), ΡΚΕ88υΚΕ 8νΠ0Η (pressure switch), ΟΑ8 νΑΊνΕ (gas valve, ΡΟ8IΤIVΕ 8ΙΟΝΑΡ А (direct signal), ΚΕνΕΚ8Ε 8ΙΟΝΑΡ ΝΑ (reverse signal) and ΕΝΟΙΝΕ ΟΡΕΚΑΤIΟN (engine operation). The working state of each element is the state ΟΝ or the state.

The operating state 8ΤЛΚΤ-υΡ ΟΟΜΜΑΝΌ (start command) is determined based on the appearance or disappearance of the start command entered in the operational control unit 6 of the operational device 10. When the start command is entered in control block 6, 8ΤЛΚΤ-υΡ ΟΟΜΜΑΝΌ (start command) is in the state ΟΝ and when the start command is not entered in control block 6, 8ΤЛΚΤ-υΡ ΡΟΜΜΑΝΌ (start command) is in the state.

Since the pressure information obtained by the gas pressure switch 5 is not directly transmitted to the control unit 6, the control unit 6 cannot directly detect the operating state for ΡΚΕ88υΚΕ 8νΠ0Η (pressure switch). Therefore, the operational state of ΚΕ88υΚΕ 8νΠ0Η (pressure switch) is determined based on the operating states of ΡΟ8IΤIVΕ 8ΙΟΝΑΡ A and ΚΕνΕΚ8Ε 8ΙΟΝΑΡ ΝΑ.

The operating status of ΟΑ8 νΑΌνΕ (gas valve) is determined based on the formation of the opening command and the closing command. The control unit 6 generates an opening command for opening the gas valve 4 and a closing command for closing the gas valve 4. Therefore, the control unit 6 can recognize the opening command and the closing command. When an opening command is formed, ΟΑ8 νΑΊΥΕ (gas valve) is in the state, and when a command is formed

- 5 023363 closing, ΟΑδ ULUE (gas valve) is in the state ΟΡΡ.

The operating state ΡΟδΙΤΙΥΕ δΙΟΝΑΡ A (direct signal is active) is determined by reflecting the state of the gas pressure switch 5. When the gas pressure switch 5 is closed, its state becomes conductive and the signal is input to the interface panel 13, the PO81Т1УЕ δΙΟΝΑΡ А state is. When the gas pressure switch 5 is open, its state becomes non-conductive and the signal is not inputted to the interface panel 13, the PO81T1UE δΙΟΝΑΡA state is OPP. On the other hand, the operating state of the KEUKBE signal δΙΟΝΑΣ ΝΑ is determined by inverting the state of the gas pressure switch 5. In contrast to the operating state ΡΟδΙΤΙΥΡ δΙΟΝΑΣ A, when the gas pressure switch 5 is closed and is in a conducting state, the signal is not sent to the interface panel 13 and the KEUKBE δΙΟΝΑΣ ΝΑ is in the OPP state. When the gas pressure switch 5 is open and is in a non-conducting state, the signal is sent to the interface panel 13 and the KEUKBE state δΙΟΝΑΣ ΝΑ is set as the state ΟΝ.

The operating state of EKSGLE ΟΡΕΚLΤIΟN (engine operation) is determined based on the rotation and stop of the output shaft 21 of the gas engine 2. The control unit 6 can detect the rotation and stop of the output shaft 21 based on the detection information received by the rotational speed detection sensor 22 of the output shaft 21.

FIG. 4 is a timing chart of the launch control during normal operation. Normal operation time refers to the state in which there is no malfunction in system 1. During normal operation, the state ΡΟδΙΤΙΥΡ δΙΟΝΑΡ A is synchronized with the working state indicated by the working state ΡKΡδδυK δ \ νΙΤί'.. and the KEUEKBE δΙΟΝΑΣ ΝΑ state is synchronized with the operating state ΟΑδ of the ULBUE gas valve.

In the idle state νΑΙΤΙΝΟ, the start command δΤΑΚΤ-υ ΟΟΜΜΑΝΏ is the state ΟΡΡ and the gas valve is in the state ΟΡΡ. Additionally, in the normal state, ΡΟδΙΤΙΥΡ δΙΟΝΑΣ A is in the state ΟΝ and the KUEUKBE signal δΙΟΝΑΣ ΝΑ is in the state ΟΡΡ. If the state of the start command δΤΑΚΤ-υΡ ΟΟΜΜΑΝΏ is set to the state выполняется, the initial state is checked, which corresponds to the state of the SNESKGL ΙΝΙΤΙΑΣ δΤЛΤΕ, containing step δ2.

When checking the initial state corresponding to the state of CHΕSCINΟ ΙΝΙΤΙΑΣ δΤЛΤΕ (step δ2), since the signal combining the direct signal ΟΡΡ and the return signal ΟΝ is received, the gas pressure before starting is checked, corresponding to the state of CHΕSCINΟ ΟΑδ Ρ ^ δΟΚΐΟΚΐ: ΒΕΡΟΚΕ δΤΑΚΤ-υΡ, containing stages δ5, δ6. When checking the gas pressure before start-up corresponding to the state of the SNESKGPS ΟΑδ ΡΚΕδδυΚΕ ΒΕPΟΚΕ δΤΑΚΤ-υΡ, the state of the gas valve ΟΑδ UΑ ^ YΕ switches from state to state ΟΝ. As a result, the gas valve 4 opens and the pressure in the gas pipe 3 becomes equal to or greater than the set pressure. As a result, the state ΡΟδIΤIУΕ δΙΟΝΑΡ Α switches from state to state ΟΡΡ and the state КЕУЕ ^ Е δΙΟΝΑΣ ΝΑ switches from state to state ΟΝ.

Additionally, when checking the gas pressure before the launch, corresponding to the state of the SNESKGLS ΟΑδ Ρ ^ δδυ ^ ΒΕPΟΚΕ δΤΑΚΤ-υΡ, (step δ6), since a signal combining the direct signal ΟΡΡ and the reverse signal ΟΝ is received, preparation for the launch is performed, corresponding to the state 'Τ ^ ΡΑ ^ ΝΟ ΡΟΚ δΤΑΚΤ-υΡ containing step δ10. In preparation for the launch, corresponding to the state ΡΚΕΡΑΚINΟ ΡΟΚ δΤΑΚΤ-υΡ, the state of the gas valve ΟΑδ УΑ ^ УΕ is switched from state to state ΟΡΡ. As a result, the gas valve 4 is closed and the pressure in the gas pipe 3 becomes lower than the set pressure. As a result, the state ΡΟδΙΤΙΥΡ δΙΟΝΑΣ A switches from state ΟΡΡ to state ΟΝ and the state REEE ^ E δΙΟΝΑΣ ΝΑ switches from state to state ΟΡΡ.

Following the preparation for the start, corresponding to the state of “ΚINΚ ΡΟΚ δΤΑΚΤ-υΡ,” the engine is awaited, corresponding to the state of νΑΙΤΙΝΟ ΡΟΚ ΕNΟINΕ δΤΑΚΤϋΡ, containing step δ11. While waiting for the engine to start, which corresponds to the state νΑΙΤΙΝΟ ΡΟΚ ΕNΟINΕ δΤΑΚΤ-υΡ, a pre-cleaning is performed by actuating the fan 9. As a result, the inside of the system 1 is ventilated. When preparing to start the engine, corresponding to the state ΡΚΕΡΑΚINΟ ΡΟΚ δΤΑΚΤ-υΡ, and waiting for the engine to start, corresponding to the state νΑΙΤΙΝΟ ΡΟΚ ΕNΟINΕ δΤΑΚΤ-υΡ, the state of the gas valve ΟΑδ UΑ ^ YΕ is in the state ΟΡΡ, the state ΡΟδIΤIUΕ δΙΟΝΑΣ A is in the state ΟΝ and the state ΚΕ УΕΚδΕ δΙΟΝΑΣ ΝΑ is in the state ΟΡΡ. It then waits to start the engine corresponding to the signal. After waiting for the start of the engine, corresponding to the state νΑΙΤΙΝΟ ΡΟΚ ΕNΟINΕ δΤΑΚΤ-υΡ, the engine is started, corresponding to the state ΕNΟINΕ δΤΑΚΤ-υΡ, containing stage δ12. When starting the engine, corresponding to the state ΈΝΟINΕ δΤΑΚΤ-υΡ, the gas valve switches from state to state ΟΝ. As a result, the gas valve 4 opens and the pressure in the gas pipe 3 becomes equal to or higher than the set pressure. As a result, the state ΡΟδΙΤΙΥΡ δΙΟΝΑΣ A switches from the state ΟΝ to the state ΟΡΡ and the state ΚΕ ΕΚΕΚδΕ δΙΟΝΑΣ ΝΑ switches from the state ΟΡΡ to the state ΟΝ. Additionally, when the engine starts, the state corresponds to ΕNΟINΕ δΤЛΚΤ-υΡ, because the engine

- 6 023363 starter rotates, engine running state ΕΝΟΙΝΕ ΟΡΕΚΑΤΙΟΝ switches from state ΘΡΡ to state ΟΝ.

After starting the engine corresponding to the state ΕΝΟΙΝΕ δΤΑΚΤ-υΡ, waiting for warming up and energy transfer is performed in order, corresponding to the state νΑΙΤΙΝΟ ROCK νΑΝΏ ИР ΑΝΏ ΡΟνΕΚ ΤΚΑΝδΜΙδδΙΟΝ, and energy transfer, corresponding to the state ΡΟνΕΚ ΤΚΑΝδΜΙδδΙΟΝ. The signal ΑΙΤΙΝΟ ΑΙΤΙΝΟ ΡΟΚ ΑΚΜ Р IR ΑΝΏ ΕΚ ΕΚ ΕΚ ΤΚΑΝ δ δ δ δ ΙΟΝ ΙΟΝ is in a state of waiting for the circuit to be closed by an automatic switch. When energy is transmitted that corresponds to the state of ΡΟνΕΚ ΤΚΑΝδΜΙδδ, the electric power generated by generator 8, when the circuit breaker is closed, is supplied to the external circuit of system 1. When the power transmission corresponding to the state of ΡΟνΕΚ ΤΚΑΝδΜΙδδΙΟΝ δΤΟΡ is interrupted, the power supply to the external circuit is terminated by opening the automatic switch. If the start command signal δΤΑΚΤυΡ ΟΟΜΜΑΝΏ is set to state ΟΡΡ, then power transmission is stopped in order, corresponding to the state ΡΟνΤΚΑΝ ΤΚΑΝδΜΙδδΙΟΝ δΤΟΡ, and engine cooling, corresponding to the state ΕΝΟΙΝΕ Ν ΏΟνΝ. When starting the engine, corresponding to the state ΕΝΟΙΝΕ δΤΑΚΤ-υΡ, waiting warming and transfer energy corresponding to the state νΑΙΤΙΝΟ ΡΟΚ νΑΚΜ υΡ ΑΝΏ ΡΟνΕΚ ΤΚΑΝδΜΙδδΙΟΝ, power transmission corresponding to the state ΡΟνΕΚ ΤΚΑΝδΜΙδδΙΟΝ, cessation of energy transfer corresponding state ΡΟνΕΚ ΤΚΑΝδΜΙδδΙΟΝ δΤΟΡ, and cooling of the engine corresponding to the state ΕΝΟΙΝΕ ΟΟΟΕ ΏΟνΝ, the state of the gas valve ΟΑδ νΑΏνΕ is the state ΟΝ, the state ΡΟδΙΤΙνΕ δΙΟΝΑΕ A is the state ΟΝ and the state ΚΕνΕΚδΕ δΙΟΝΑΕ ΝΑ is I state ΟΝ.

After cooling of the engine, corresponding to the state ΟΟΟΕ ΟΟΟΕ двигателяνΝ, the engine is shut off and cooling, corresponding to the state ΕΝΟΙΝΕ δΗΠΤΏΟνΝ ΑΝΏ ΑΡΤΕΚΟΟΟΕΙΝΟ. When the engine is disconnected and cooled, corresponding to the state ΕΝΟΙΝΕ δΗυΤΏΟνΝ ΑΝΏ ΑΡΤΕΚΟΟΟΕΙΝΟ, the state of the gas valve ΟΑδ νΑΏνΕ is switched from state to state ΟΡΡ. As the gas valve 4 closes, ΡΟδΙΤΙνΕ δΙΟΝΑΣ A switches from state ΟΡΡ to state ΟΝ and the reverse signal ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ switches from state to state ΟΡΡ. Therefore, when the engine is turned off and cooled, corresponding to the state of δΗυΤΏΟνΝ ΑΝΏ ΑΡΤΕΚΟΟΟΕΙΝΟ, the supply of fuel gas is stopped and the gas engine 2 is turned off.

Following the engine shutdown and cooling, corresponding to the state Η δΗυΤΏΟνΝ Ν ΑΡΤΕΚΟΟΟΕΙΝΟ, system 1 is again in the standby state, which corresponds to the state ν.

FIG. 5-7 shows timing charts of the launch control in the event of a fault.

FIG. 5 shows an example of a timing diagram of a launch control in the event of a first failure. When a first fault occurs, when checking the initial state corresponding to the state ΟΗΕΟΚΙΝΟ ΙΝΙΤΙΑΏ δΤΑΤΕ, containing stage δ2, the occurrence of a fault is detected.

In the idle state, corresponding to the state νΑΙΤΙΝΟ, the state of the start command δΤΑΚΤ-υΡ ΟΟΜΜΑΝΏ is the state ΟΡΡ and the state of the gas valve ΟΑδ νΑΏνΕ is the state. Additionally, ΡΟδΙΤΙνΕ δΙΟΝΑΕ A and ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ are both in the state ΟΝ. In such a state, when the state of the start command δΤΑΚΤ-υΡ ΟΟΜΜΑΝΏ enters the state ΟΝ, the initial state is checked, corresponding to the state ΟΗΕΟΚΙΝΟ ΙΝΙΤΙΑΏ δΤΑΤΕ, containing stage δ2.

When, when checking the initial state corresponding to the state ΟΗΕΟΚΙΝΟ ΙΝΙΤΙΑΏ δ этап, (step δ2), the signal combining the direct signal and the return signal is not received, shutdown is performed due to the first fault, corresponding to the state δΗυΤΏΟνΝ ΏϋΕ ΤΟ ΡΙΚδΤ ΑΒΝΟΚΜΑΕΙΤΥ, containing stages δ3, δ4. When turned off due to the first fault corresponding to the state δΗυΤΏΟνΝ ΏυΕ ΤΟ ΡΙΚδΤ ΑΒΝΟΚΜΑΕΙΤΥ, the occurrence of the first fault is reported and the operation of the system 1 stops.

When a first fault occurs, the ΡΟδ неисправνΕ δΙΟΝΑΕ A and ΚΕνΕΚδΕ δΙΟΝΑΕ ΝΑ states can follow three models. The first model corresponds to the fact that the state ΡΟδΙΤΙνΕ δΙΟΝΑΕ A and the states ΚΕνΕΚδΕ δΙΟΝΑΏ ΝΑ are both in the state ΟΝ. The second model corresponds to the fact that the state ΡΟδΙΤΙνΕ δΙΟΝΑΕ A and the state ΚΕνΕΚδΕ δΙΟΝΑΏ ΝΑ are both in the state ΟΡΡ. The third model corresponds to the fact that the state ΡΟδΙΤΙνΕ δΙΟΝΑΕ A is in the state ΟΡΡ and the state ΚΕνΕΚδΕ δΙΟΝΑΕ ΝΑ is in the state ΟΝ. The most likely failures are the following: a failure of the interface panel 13 or a short circuit between the return signal line 14b and the power source occurred in the first model; The failure of the interface panel or the interruption of the direct signal line 14a occurred in the second model; the failure of the circuit of the gas pressure switch 5, the interruption of the output line 12a, 12b δν or the failure of the closing of the gas valve 4 occurred in the third model. The example shown in FIG. 5 illustrates the first model when the first malfunction occurs.

- 7 023363

FIG. 6 shows an example of a timing diagram of a launch control in the event of a second fault. If a second malfunction occurs when checking the gas pressure before starting, which corresponds to the state ΟΗΕΟΚΙΝΟ ΟΑδ ΡΚΕδδυΚΕΚΕ ΒΕΡΟΚΕ δΤΑΚΤ-υΡ, containing step 6, a fault is detected.

The operating states of the respective elements when a second fault occurs (FIG. 6) correspond to the operating states of the respective elements during normal operation (FIG. 4).

When checking the gas pressure before start-up, corresponding to the state СΗΕСΚINΟ ΟΑδ ΡΚΕδδυΚΕ ΒΕΡΟΚΕ δΤΑΚΤ-υΡ, the state of the gas valve ΟΑδ ААЕ \ Е switches from state to state ΟΝ. If no fault occurs, the state ΡΟδΡΟνΙΤί δΙΟΝΑΣ A switches from state to state ΟΡΡ and the state of the return signal ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ switches from state to state ΟΝ. However, as shown in FIG. 6, switching between states did not occur, therefore the state ΡΟδΡΟνΕ δΙΟΝΑΣ A is the state ΟΝ and the state of the reverse signal сигналаνΕΚδΕ δΙΟΝΑΣ ΝΑ is the state ΟΡΡ.

As a result, when checking the gas pressure before starting, which corresponds to the state ΟΗΕΟΚΙΝΟ ΟΑδ ΡΚΕδδυΚΕ ΒΕΡΟΚΕ δΤΑΚΤ-υΡ, the signal combining the direct signal ΟΡΡ and the return signal was not received. Therefore, the shutdown is performed due to the second fault, corresponding to the state δΗυΤΌΟνΝ ΌυΕ ΤΟ δΕΟΟΝΌ ΑΒΝΟΚΜΑΕΙΤΥ, containing the steps δ7-δ9. When turned off due to a second fault, corresponding to the state of δΗυΤΌΟνΝ ΌυΕ ΤΟ δΕΟΟΝΌ ΑΒΝΟΚΜΑΕΙΤΥ, the command to close the gas valve 4 is formed, a second fault is reported and system 1 is stopped.

If a second malfunction occurs, the ΡΟδΙΤΙνΕ δΙΟΝΑΣ A and ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ states can follow three models. The first model corresponds to the fact that the state ΡΟδΙΤΙνΕ δΙΟΝΑΣ A and the state ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ is the state ΟΝ for both. The second model corresponds to the fact that the state ΡΟδΙΤΙΥΕ δΙΟΝΑΣ A and the state ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ is ΟΡΡ for both. The third model corresponds to the fact that the state ΡΟδΙΤΙΥΕ δΙΟΝΑΣ A is the state ΟΝ and the state ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ is the state ΟΡΡ. The most likely failures are the following: a failure of the interface panel 13 or a short circuit between the direct signal line 14a and the power source occurred in the first model; the failure of the interface panel 13 or the interruption of the return signal line 14b occurred in the second model; failure to open the gas pressure switch 5, a short circuit between the output lines 12a, 12b δν and a power source, failure to open the gas valve 4 or decrease in gas pressure occurred in the third model. The example in FIG. 6 shows a third model when a second malfunction occurs.

FIG. 7 shows a state in which, during operation of the gas engine 2, the gas pressure decreases below the set pressure. During operation of the gas engine 2, namely, if the engine operation state corresponding to the state ΕΝΟΙΝΕ ΟΡΕΚΑΤΙΟΝ is in the state ΟΝ, the engine starts corresponding to the state ΕΝΟΙΝΕ δΤΑΚΤ-υΡ, waiting for warm-up and energy transfer, corresponding to the state νΑΙΤΙΝΟ ΡΟΚ νΑΚΜ υΡ ΑΝΌ ΡΟνΕΚ ΤΚΑΝδΜΙδΙΟΝΙΟΝ, energy transfer corresponding to the state ΡΟνΡΟ ΕΚδΜΙδδΙΟΝ, cessation of energy transfer, corresponding to the state ΡΟνΕΚ ΤΚΑΝδΤΚΑΝδΜΙΜΙ δΙΟΝ, and engine cooling, corresponding to the state ΟνΝ.

During operation of the gas engine 2, the control unit 6 always controls the operating states for ΡΟδΙΤΙνΕ δΙΟΝΑΣ A and ΚΕνΕΚδΕ δΙΟΝΑΣ ΝΑ. When it becomes impossible, during operation, to receive a signal combining the direct signal and the return signal, an abnormal gas pressure is detected, corresponding to the state ΌΕΤΕΟΤΙΝΟ ΑΒΝΟΚΜΑΕ ΟΑδ ΡΚΕδδυΚΕ. If the time taken to detect an abnormal gas pressure corresponding to the state ΌΕΤΕΟΤΙΝΟ ΑΒΝΟΚΜΑΕ ΟΑδ ΡΚΕδδυΚΕ continues for a certain period of time, the control unit 6 determines that a malfunction has occurred that is associated with the gas pressure. If a gas pressure malfunction is detected, it is disconnected due to a gas pressure malfunction corresponding to the shutdown condition due to abnormal gas pressure δΗυΤΌΟνΝ ΌυΕ ΤΟ ΑΒΝΟΚΜΑΕ ΟΑδ ΡΚΕδδυΚΕ. When disconnected due to a gas pressure fault corresponding to the state δΗυΤΌΟνΝ υΕ ΤΟ ΑΒΝΟΚΜΑΕ ΟΑδ ΡΚΕδδυΚΕ, a command is generated for gas valve 4, a gas pressure fault is reported and the operation of system 1 is terminated.

When a malfunction occurs for a reason not related to gas pressure, when checking the initial state corresponding to the state ΟΗΕΟΚΙΝΟ ΙΝΙΤΙΑΣ δ и, and checking the gas pressure before starting, corresponding to the state ΟΗΕΟΚΙΝΟ ΟΑδ ΡΚΕδδυυΤΑΚΤ ΒΕΡΟΚΕ δΤΑΚΤ-υΡ, it is decided that the gas pressure switch 5 and mechanism 7 pressure information transfers are serviceable. Therefore, it is highly likely that if a malfunction is detected upon detection of a malfunction, the cause of the malfunction is in effect a decrease in gas pressure.

Next, the effects of the gas engine system 1 according to the present embodiment will be described.

In the present embodiment, the control unit 6 comprises a first determination section 102 for performing the first measurement, an opening section 104, a second determination section 105 for performing the second measurement, a closing section 107 and a failure detection section 108. Therefore, the present embodiment can determine whether the pressure information actually transmitted from the gas pressure switch 5 to the control unit 6 corresponds to the gas pressure determined during opening and closing of the gas valve 4, and based on the result of the determination can determine whether a fault has occurred.

In the present embodiment, the control unit 6 further comprises a start section 110. Therefore, when a malfunction occurs in the gas pressure detection mechanism, such as the pressure information transmission mechanism 7 or the pressure relay 5, it is possible to prevent the gas engine 2 from starting up.

In the present embodiment, a pressure switch 5 having a b contact is used as a pressure sensor for outputting pressure information corresponding to a gas pressure. Therefore, in the present embodiment, if it is determined before the opening of the gas valve 4 that the pressure relay 5 is in a non-conducting state, a failure of the pressure relay 5 or the pressure information transmission mechanism 7 can be detected.

The present embodiment further comprises an interface panel 13 for generating a signal combining a direct signal reflecting the state of the contact of the pressure relay 5, and a return signal obtained by inverting the state of the contact of the gas pressure relay 5. Therefore, the present embodiment makes it possible to obtain an output signal despite the use of a pressure switch 5 having a b-contact, even if the pressure switch 5 is in a non-conducting state.

In the present embodiment, the following modified configurations may be adopted.

In the present embodiment, the pressure sensor outputting pressure information corresponding to the pressure of the gas is a pressure switch having a b contact. In another embodiment, instead of a pressure switch that outputs only the result of a comparison between gas pressure and a predetermined value, system 1 may contain a pressure sensor that outputs a pressure signal containing information corresponding to the gas pressure value.

In another embodiment, instead of a pressure switch having an L-contact, system 1 may include a pressure switch having an a-contact. In this embodiment, it is possible to obtain pressure information directly corresponding to a high pressure and a low gas pressure.

In the present embodiment, the transmission mechanism for transmitting pressure information from the pressure sensor to the control device comprises output lines 12a and 12b δν, an interface panel and a forward signal line 14a, and a return signal line 14b. The interface panel 13 and the forward signal line 14a and the reverse signal line 14b are provided to invert the signal. Therefore, in another embodiment, the transmission mechanism may also contain only output lines 12a and 12b δν. In this case, each of the output lines 12a and 12δδ connects a pressure sensor and a control device.

Claims (5)

CLAIM 1. A gas engine system comprising a gas engine; gas channel for supplying fuel gas to the gas engine; gas valve for opening and closing the gas channel; a control device for detecting the opening and closing of the gas valve and control of the gas valve; a pressure sensor for outputting pressure information corresponding to a gas pressure in the gas channel on the outlet side of the gas valve; and a transmission mechanism for transmitting pressure information from a pressure sensor to a control device, in which the control device comprises a first determination section for determining, as a first measurement based on the pressure information, whether the gas pressure is below the set pressure, the control device recognizes that gas valve closed; the opening section for opening the gas valve, if at the first determination it is determined that the gas pressure is low pressure; a second determination section for determining as a second measurement whether the gas pressure is higher or equal to a predetermined pressure, based on the pressure information, while the control device recognizes that the gas valve is open, if the first measurement indicates that the gas pressure is low pressure; a closing section for closing the gas valve after the second measurement and - 9 023363 fault detection section for fault detection, if during the first measurement it is determined that the gas pressure is high pressure, or if during the second measurement it is determined that the gas pressure is low pressure. 2. The system of claim 1, comprising a start-up command input device in which the control device is intended to control the gas engine and further comprises a start section for performing the first measurement and the second measurement before starting the gas engine when the start command is received; and a start-up section for opening the gas valve and starting up the gas engine, if during the first measurement it is determined that the gas pressure is low pressure, and if during the second measurement it is established that the gas pressure is high pressure. 3. The system according to claim 2, in which the pressure sensor is a pressure switch having a b-contact, which is configured to be set to a conducting state when the gas pressure is low pressure, and which is made to be able to be set to a non-conducting state when the gas pressure is high pressure. 4. The system according to claim 2, in which the pressure sensor is a pressure switch having a contact that is configured to be installed in a conducting state when the gas pressure is high pressure and that is configured to be installed in a non-conducting state when the gas pressure is low pressure. 5. The system of claim 3, wherein the pressure information transmission mechanism further comprises a logic circuit for generating a signal combining a direct signal reflecting the conductive or non-conductive state of the pressure relay, and a reverse signal that inverts the conductive or non-conductive state of the pressure relay.